I entered on a S7 but now use S8 plus.
The main flaws I've had is it crashes when leaving or entering WiFi and when swapping between apps it often crashes on me. Submitted reports so hopefully they'll fix it.
Spent hours in the sun yesterday watching YouTube and trying to slay but I couldn't put up with the castle of 're loading the app so many times.
It is amazing how far RS has come and it runs very well on mobile.